多基站下基于信号到达时间的室内三维定位

对基于无线电信号的到达时间(TOA)的定位技术进行了研究.首先,建立了TOA测量值与真实值间的函数关系,通过求解含惩罚项的非线性最小二乘问题实现终端定位和噪声估计,并在已有研究的基础上提出了Alternating Iterative Reweighting(AIR)算法;其次,利用基站之间的几何位置进行筛选,根据每个终端信息完成自适应的最少基站的选择及定位;并结合物理特性实现终端运动轨迹预测;最后,根据基站通信半径筛选出可被定位终端,完成定位精度与终端平均连接度数之间关系的建模.

Time of Arrival Based Indoor 3-D Locolization using Multiple Base Stations

Relying on the time of arrival (TOA) of radio signal in wireless communications,this paper analyzes the indoor three dimensional localization.At first,the functional relationship between TOA measure time and real time is established.The terminal location and noise estimation are realized by solving nonlinear least squares problems containing penalty term.And an innovative Alternating Iterative Reweighting (AIR) algorithm is provided.Utilizing the geometrical position between base stations and the information of the terminal to select base stations,each terminal can select the least number of bastion stations adaptively to locate the position.Then combining the physical characteristics,we predict the terminal trajectory.Finally,according on the base station of communication radius,the terminal whose location can be determined are selected.And the model of the relationship between localization accuracy and average terminal connection is built.